1/4 c. onion, grated or finely chopped
1/2 c. butter, melted
1/4 c. mustard
1 tbsp. poppy seed
6 hard rolls, split
Ham, sliced
Swiss cheese, sliced
Tin foil

Melt butter and remaining ingredients. Spread the mixture generously on both sides of hard roll. Put ham and cheese in the bun. Wrap each sandwich individually in foil. Bake at 350 degrees for 15 minutes. Serves 6.